If anyone is going to the Tower (or other London sites) and travelling by train (or has a train season ticket) check out this site, it gives two for one admission if you print out the coupon and present it with your train ticket (or pass if you work for a Train company). They are also available in a booklet "London 2 for 1" available at mainline stations.

If anyone is going to the Tower (or other London sites) and travelling by train (or has a train season ticket) check out this site, it gives two for one admission if you print out the coupon and present it with your train ticket (or pass if you work for a Train company). They are also available in a booklet "London 2 for 1" available at mainline stations.

This offer appears to only be available to First Great Western train users but your post uses vague words like 'train', 'train ticket', 'Train company' and 'mainline stations'. Can you use these vouchers whilst travelling on other train networks? I'm sorry if this question sounds silly but I'm not overly familiar with using the train network and feel I may be missing something here.